Which choice correctly uses the comparative pronoun in the sentence?

In the context of comparative pronouns, the correct choice is "he." Comparative pronouns are used to compare differences between the entities they refer to, typically using forms that indicate comparison. In this case, "he" functions as a singular pronoun that can be compared to another subject in various contexts, making it suitable for sentences that require a comparison in a gender-specific manner.

While "me," "they," and "s/he" each serve distinct grammatical roles — "me" as an objective pronoun, "they" as a plural subject pronoun, and "s/he" as a gender-neutral substitution — they do not effectively serve the function of comparison necessary in the context provided. Thus, "he" stands out as the correct option for properly utilizing a comparative pronoun in a sentence.